Cheap flights from Ontario to San Jose from $59

The month of October is, on average, the cheapest month to fly to San Jose, California from Ontario, with most prices found around $248. If you are unable to visit San Jose, California during the month of October, then departing from Ontario during the month September is also very affordable. Most momondo users find prices during this month for around $259.

On average, the least expensive day to fly to San Jose, California from Ontario is on a Thursday. momondo users have found tickets for Thursday departures for as low as $184. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Ontario to San Jose, California for around $331.

The cheapest time of day to fly to San Jose, California is in the afternoon when flights can be purchased for as low as $198. In the evening is when there is more demand to fly to San Jose, California, so prices are often more expensive at around $279 per ticket.

Fly from Ontario to San Jose for the best Ontario - San Jose flight prices

You are more likely to see cheaper flights to San Jose, California from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to San Jose, California for around $369 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Jose, California from Ontario for as low as $225 on momondo.

There is only 1 cabin class available to choose from on Ontario to San Jose, California flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between Ontario to San Jose, California.

As of August 2026, prices for Ontario to San Jose, California flights are approximately 22% cheaper when compared to flights at the same time last year.

Southwest and Alaska Airlines are the most popular carriers operating from Ontario to San Jose

United Airlines, Southwest and Frontier are the top three most popular airlines that fly to San Jose, California from Ontario according to our data. United Airlines is the first choice among our users, with 30% of people opting to fly with this airline when traveling to San Jose, California. Keep in mind that there are 10 different airlines that fly to San Jose, California on a routine basis, so you have a few additional options to choose from.

The number of flights available between Ontario and San Jose, California is 1 per day as of August 2026. The most frequent departure time is 6:00AM, with 53% of daily flights leaving at noon.

As of August 2026, 12 flights take off from Ontario and land in San Jose, California each week. The most common flight departure day for this route is Mon, with 33% of weekly flights taking off on this day.